Why is Dipavali (Festival of lights) celebrated on a new moon? Origin of calender, almanac, Christian calender vs ancient roman calenders, solar dates vs Lunar dates (Tithis). Importance of tithis and the mathematics of calculating these tithis. And, why are they so important for health and wellbeing, for Ayurveda practitioners, for Jyotishis or anyone following a spiritual life.
